what's the meaning of error no. NRF_ERROR_BUSY

[Ricky]

When I use sd_ble_gap_adv_start( ), sometimes get return value NRF_ERROR_BUSY . What's the meaning of this error No. ?

[Nikita]

Maybe you trying to call sd_ble_gap_adv_start() when you already advertising and get this error?

[Nikita]

I don't know, what are you doing wrong, but this works for me without any error:

static bool advertising_state = false;

static void on_ble_evt(ble_evt_t * p_ble_evt)
{
    uint32_t        err_code;
    switch (p_ble_evt->header.evt_id)
    {
        case BLE_GAP_EVT_CONNECTED:
            advertising_state = false;
...
        case BLE_GAP_EVT_TIMEOUT:
            if (p_ble_evt->evt.gap_evt.params.timeout.src == BLE_GAP_TIMEOUT_SRC_ADVERTISEMENT)
            {
                led_off(ADVERTISING_LED_PIN_NO);
                advertising_state = false;
            }
            break;
...
}

static void advertising_start(void)
{

    uint32_t             err_code;
    ble_gap_adv_params_t adv_params;
    ble_gap_whitelist_t  whitelist;
    uint32_t             count;
    
    advertising_state = true;
    led_off(ADVERTISING_LED_PIN_NO);
...
    adv_params.timeout  = 1;
...
    err_code = sd_ble_gap_adv_start(&adv_params);
    APP_ERROR_CHECK(err_code);
    
    led_on(ADVERTISING_LED_PIN_NO);
}

static void button_event_handler(uint8_t pin_no, uint8_t button_action)
{
    if (button_action == APP_BUTTON_PUSH)
    {
        switch (pin_no)
        {
            case KEY_PRESS_BUTTON_PIN_NO:
            {
                uint32_t err_code;
                if (advertising_state == true)
                {
                    err_code = sd_ble_gap_adv_stop();
                    APP_ERROR_CHECK(err_code);
                }
                advertising_start();
                break;
            }
            default:
                APP_ERROR_HANDLER(pin_no);
                break;
        }
    }
}